초록 ▼

A circuit and apparatus for magnetically sensing fluid flow and applying voltage to a load has a spring loaded check valve disposed within a conduit and provided with a magnetic shield. A magnet is located on one side of the magnetic shield while a sensor, associated with the valve, is located on th

A circuit and apparatus for magnetically sensing fluid flow and applying voltage to a load has a spring loaded check valve disposed within a conduit and provided with a magnetic shield. A magnet is located on one side of the magnetic shield while a sensor, associated with the valve, is located on the opposite side of the magnetic shield. The check valve, and hence the magnetic shield, moves to permit fluid flow. When the magnetic shield moves due to fluid flow, the magnet activates the sensor. A load control circuit includes a supply terminal for receiving a supply voltage and a detector which detects a condition requiring the operation of a load. The detector causes a threshold voltage to be generated from the supply voltage, and a time delay controller controls the time required to generate the threshold voltage. A DIAC or equivalent element conducts to generate a first trigger signal once the threshold voltage is achieved, and a silicon-controlled rectifier (SCR) generates a second trigger signal in response to the first trigger signal. The circuit includes an opto-TRIAC and triac which are rendered conductive by the second trigger signal to cause a voltage to be provided to the load.

대표청구항 ▼

[ What is claimed is:] [1.]1. A spring loaded check valve comprising:an inlet;an outlet;spring loaded valve member means which prevents passage of fluid from the inlet to the outlet in a closed position, and which allows passage of fluid from the inlet to the outlet in an open position; andmagnetic

[ What is claimed is:] [1.]1. A spring loaded check valve comprising:an inlet;an outlet;spring loaded valve member means which prevents passage of fluid from the inlet to the outlet in a closed position, and which allows passage of fluid from the inlet to the outlet in an open position; andmagnetic switch means associated with the spring loaded valve member means for sensing a position of the spring loaded valve member means;said magnetic switch means further comprising:magnetic shield means attached to the spring loaded valve member means for movement therewith between the open position and closed position; andcircuit means to sense the magnetic shield means, whereby the position of the spring loaded valve member means may be determined.